光纤非线性效应对光子时间拉伸模数转换系统性能的影响

发布时间：2018-11-19 11:26

【摘要】：光子时间拉伸模数转换(PTS-ADC)系统利用光纤中的色散效应对被采样模拟信号进行时间拉伸和带宽压缩,可大幅提高电模数转换器(ADC)的采样率和带宽。现有的PTS-ADC系统需要很长的色散光纤作为传输介质,它所带来的损耗限制了系统信噪比(SNR)和有效比特位(ENOB)。虽可通过提高光脉冲功率来改善系统的SNR,但色散光纤中的非线性效应利用了信噪比的提升。从理论推导、数值仿真和实验验证三个方面综合分析了非线性效应对PTS-ADC系统性能的影响,包括系统功率传输函数、载波与谐波功率比(CIR)。结果表明:第一段色散光纤中的非线性效应不会使得被采样模拟信号失真,相反地会提高系统带宽和CIR;而第二段色散光纤中的非线性效应则会恶化系统性能,应予以避免。
[Abstract]:Photon time stretching A / D conversion (PTS-ADC) system can greatly improve the sampling rate and bandwidth of electro A / D converter (ADC) by using dispersion effect in optical fiber to compress the sampled analog signal in time and bandwidth. The existing PTS-ADC system needs very long dispersive fiber as the transmission medium. The loss caused by it limits the signal-to-noise ratio (SNR) and the effective bit (ENOB). (ENOB).) of the system. Although the SNR, of the system can be improved by increasing the optical pulse power, the nonlinear effect in the dispersive fiber takes advantage of the increase of SNR. The influence of nonlinear effect on the performance of PTS-ADC system is comprehensively analyzed from three aspects: theoretical derivation, numerical simulation and experimental verification, including system power transmission function, carrier to harmonic power ratio (CIR). The results show that the nonlinear effect in the first dispersive fiber will not distort the sampled analog signal, on the contrary, it will improve the system bandwidth and CIR;, while the nonlinear effect in the second dispersive fiber will deteriorate the system performance, which should be avoided.
【作者单位】：上海交通大学区域光纤通信网与新型光通信系统国家重点实验室;解放军装备指挥技术学院光电装备系;
【基金】：国家自然科学基金(61127016,61007052,61071011) 科技部国际合作项目(2011DFA11780) 教育部回国基金项目上海市学科带头人计划(12XD1406400) 上海市浦江人才计划(12PJ1405600)
【分类号】：TN929.11

【参考文献】